There's a fencing flashback, where the protagonist accidentally gets stabbed. Blood briefly sprays onto his shirt and there is a split second shot of a piece of flesh on the sword; castration is strongly implied.
During a fencing championship, one of the characters wears a bloody jumpsuit.
A human dart challenge is taken, resulting in a dart stabbing the belly button and right testicle. No blood, but might offend some viewers.
The antagonist gets shot in the foot with a nail gun. No blood.
Two characters jump out a window, knocking out the antagonist. Glass shards are everywhere, but nothing bloody.